Valve and seat for steam-engines



(No Model.)

J. WHEELOOK.

VALVE AND SEAT FOR STEAM ENGINES; No. 455,810.

Patented July 14, 1891.

Mum mm Wflwewea U ITED. STATES PATENT OFFICE.

JEROME VHEELOOK, OF VORCES'FR, MASSACHUSETTS.

VALVE AND SEAT FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 455,810, dated July 14, 1891.

Application filed December 2, 1890. Serial No. 373,348. (No model.) 7

To all whom it may concern:

Be it known that I, JEROME WHEELooK, a citizen of the United States, and aresident of Worcester, in the county of.Worcester and State of Massachusetts, have invented certain new and useful Improvements in Valves and Seats for Steam-Engines, of which the following, in connection with the accompanying drawings, is a specification to enable those skilled in the art to which my invention belongs to make and use the same.

My invention relates to that class of valves which are generally known as the gridiron variety, and more particularly to that shown, described, and claimed in Letters Patent No. 440,523, granted to me on November 11, 1890, in which one shell contains both cut-off and exhaust valve seats; and my-invention has for its object to so construct said shell and seats that the process of planing and scraping of the seats may be done without interfering, and, furthermore, to give to the seats a degree of strength which was incompatible in the valve claimed in the above-mentioned patent on account of its particular construction.

To this end my invention consists in mak-.

ing the exhaust-seat independent and removable from the shell, and at the same time of sufficient strength, so that a re-enforcing bolt or other similar means may be dispensed with altogether, as is illustrated in the accompanying drawings, in which- Figure 1 represents a central cross-section of one end of the steam-engine cylinder with my improved valve in proper position. Fig. 2 is an elevation of the valve-shell, looking in the direction of arrow 1, Fig. 1, and illustrating the manner in which the removable seat is retained in its proper position in the shell. Fig. 3 is a vertical section through the cylinder and valve-shell. Fig. 4 represents a modification in the construction of the removable seat; and Fig. 5 shows the removable seat as it' appears when taken out of its place in the shell, the valve proper being let off, but its operating-lug being shown in section.

In the drawings,A is the steam-engine cylinder, having a steam-chest B, from which steam is supplied to the cut-off valves, the seat 0 of which is made integral with the heads 0 C and thus form the shell,while the valve 0 obtains a reciprocatingmotion on the seat 0 from the shaft D in the ordinary manner.

The seat C is provided with the bridges c, in which the driving-shaft D for the exhaustvalve-rests, and which are planed off at c to allow for a close contactwith the exhaust-valve seat I) which is made removable, and the ends of which are slightly tapered, as at d, Fig. 3, re properly fit into the shell, where it is retained and secured by means of screws 02'. (See Figs. 1 and 2.) It will therefore be understood that the exhaust-seat is firmly attached to the shell and can readily be replaced by a new seat in case of breakage without rendering it necessary to substitute a new shell complete In order to prevent the exhaust-valve from interfering with the cut-off seat and its bridges,1 provide in the exhaustseat a recess (Z of sufficient depth to receive the valve Dithetop of which will be below the top of the seat, as shown in Fig. 1.

In Figs. 4 and 5 Ihave represented a modification in the construction of the removable seat. In this instance Ihave provided a clear space a in the outside of the "seat E to allow the luge of the valve E to project downward, and thus be operated from a shaft E, which is located below the valve E. By thisconstruction I am enabled to bring the cut-off seat and the exhaust-valve close together, so that very little waste of steam occurs, and by placing the driving-shaft E below and in the position illustrated I remove an obstruction which would materially decrease the passage for the-steam from the cut-off valve into the cylinder.

In the drawings I have shown the exhaustseat as beingmaderemovable; butIdonot confine my invention to that fact alone, since the cut-olt seat may be made removable instead of the exhaust-seat, or theymay be so arranged that either or both may be adapted to be taken from the shell without in any way altering the gist of my invention. Therefore hat I claim as my invention, and desire to secure by Letters Patent, is-

1. In a steam-engine, aremovable shell containing the seats for steam and exhaust valves so arranged that either seat may be removed from the shell, substantially as and for the purpose set forth.

2. In a valve-shell, the combination, with with a valve and its seat, of a shaft through the removable valve-seat, 0f the independent which motion is imparted to said valve, and stationary valve-seat having bridges which which is located on that side of the contact serve as guides and bearings for the removline between valve and. seat Within the shell g able seat, substantially as described. which is opposite to that of the valve, sub- :5

3. In a valve-shell, the combination, with stantially as described. the stationary valve-seat, of the removable JEROME XVHEELOOK. seat having a recess to receive the valve, sub- 1 Witnesses:

stantially as and for the purpose set forth. L. A. \VHEELOCK, 3:9 4. Theeombinati0n,with the shellprovided F. L. ROBINSON. 

